BQ40Z80: The DSG isn't working on the board

OverAgent712

Part Number: BQ40Z80

Tool/software:

The bq is programming and everything is fine, the voltage shows at the output, but when connected to load the voltage drops to 0.3V. Not able to figure out the reason ?

9 months ago

0 Alan Frias 9 months ago

TI__Mastermind 30490 points

Hello,

Are you able to recreate the issue with the EVM (BQ40Z80EVM-020), it sounds like its a hardware issue within the schematic/layout. The source of the big part of the voltage drop seen within a functioning board is from the sensing resistor.

Regards,
Alan

+1 OverAgent712 8 months ago in reply to Alan Frias

Intellectual 470 points

Hello,

Yes, found out that the zener diode was placed wrongly. Is there a problem if the zener diode is removed ?

+1 Alan Frias 8 months ago in reply to OverAgent712

TI__Mastermind 30490 points

Hello,

Yes, there is a voltage drop across the zener diode or could prevent voltage from going through as well depending on orientation of the component.

Thank you,
Alan

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BQ40Z80: The DSG isn't working on the board